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Effect of carbon nanotubes on electrical and mechanical properties of multiwalled carbon nanotubes/epoxy coatings / M. Zabet in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 1 (01/2016)
[article]
Titre : Effect of carbon nanotubes on electrical and mechanical properties of multiwalled carbon nanotubes/epoxy coatings Type de document : texte imprimé Auteurs : M. Zabet, Auteur ; S. Moradian, Auteur ; Z. Ranjbar, Auteur ; N. Zanganeh, Auteur Année de publication : 2016 Article en page(s) : p. 191-200 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermomécanique dynamique
Conduction électrique
Dépôt électrolytique
Epoxydes
Microscopie électronique à balayage
Nanotubes de carbone à parois multiplesUn nanotube de carbone multifeuillet est constitué de plusieurs feuillets de graphènes enroulés les uns autour des autres. Il existe deux modèles pour décrire la structure des nanotubes multifeuillets :
- le modèle poupée russe: les plans de graphène sont arrangés en cylindres concentriques ;
- le modèle parchemin: un seul feuillet de graphène est enroulé sur lui-même, comme une feuille de papier.
Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniquesIndex. décimale : 667.9 Revêtements et enduits Résumé : In the present study, attempts were made to enhance conductivity of electrocoats (based on epoxy amine adduct) containing NH2-multiwalled carbon nanotubes (MWCNTs). The weight percent of incorporated MWCNTS into the electrocoat matrix varied in the range of 0.6–3.6 wt% to obtain a series of electrocoatings. These were then applied on steel substrates by a cathodic electrodeposition technique. Electrocoated films were characterized utilizing scanning electron microscopy and optical microscopy. The results illustrated that electrical conductivity was enhanced by increasing of the MWCNT load. At the percolation threshold, throwing power was dropped while the recoating ability was enhanced. Mechanical behavior of nanocomposites containing MWCNTs in the range of 0–2.8 wt% was investigated by dynamic mechanical thermal analysis (DMTA) and nanoindentation test methods. DMTA analysis revealed that the width of tan δ was increased by the addition of nanotubes up to 2.8 (wt%). Also, the results obtained from the nanoindentation test showed that the elastic modulus and hardness of the nanocomposites were decreased by the addition of MWCNTs. Note de contenu : - EXPERIMENTAL : Materials and sample preparation - Electrodeposition procedures - Instrumentation
- RESULTS AND DISCUSSION : Electrodeposition of samples - Conductivity of coated films containing MWCNT - Morphological properties of the films containing MWCNT - Throwing power measurement - Mechanical properties of MWCNT/epoxy coatingsDOI : 10.1007/s11998-015-9723-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9723-y.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25388
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 1 (01/2016) . - p. 191-200[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17819 - Périodique Bibliothèque principale Documentaires Disponible Effect of cyclic stress while being dried on the mechanical properties and thermostability of leathers / Jinbao Huang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 10 (10/2018)
[article]
Titre : Effect of cyclic stress while being dried on the mechanical properties and thermostability of leathers Type de document : texte imprimé Auteurs : Jinbao Huang, Auteur ; Keyong Tang, Auteur ; Pengyuan Yang ; Xialian Fan ; Fang Wang ; Jing Du ; Cheng-Kung Liu Année de publication : 2018 Article en page(s) : p. 318-325 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Allongement à la rupture
Chaleur sèche
Contraintes thermiques
Cuir -- Séchage
Cuirs et peaux -- Propriétés mécaniques
Fourier, Spectroscopie infrarouge à transformée de
Microscopie électronique à balayage
PyrolyseLa pyrolyse est la décomposition ou thermolyse d'un composé organique par la chaleur pour obtenir d'autres produits (gaz et matière) qu'il ne contenait pas. L'opération est réalisée en l'absence d'oxygène ou en atmosphère pauvre en oxygène pour éviter l'oxydation et la combustion (L’opération ne produit donc pas de flamme). Il s'agit du premier stade de transformation thermique après la déshydratation.
Elle permet généralement d'obtenir un solide carboné, une huile et un gaz. Elle débute à un niveau de température relativement bas (à partir de 200 °C) et se poursuit jusqu'à 1 000 °C environ. Selon la température, la proportion des trois composés résultants est différente.
Résistance à la traction
Résistance thermique
Rétrécissement (matériaux)
Stabilité hydrothermaleIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Various mechanical processes are usually applied in leather making and using, which inevitably affect the structure and properties of leathers, such as mechanical performance and hydrothermal stability. Cyclic stress is very common in leather making, which may cause different changes to leather, compared with constant stress. However, very few results have been reported regarding the influence of cyclic stress on leathers. In the present work, cyclic stresses were applied to leather in drying. The influences of cyclic stress on the mechanical properties, hydrothermal stability and dry heat resistance of leathers were investigated. Also, the cross section of leather was observed with SEM, and the changes of hydrogen bonds in collagen fibers were characterized and discussed with the results of FT-IR. It was indicated that stress in drying leads to orientation of collagen fibers and increased mechanical strength. A balance is set up between tensile strength and elongation at break of leathers with the action cyclic stress. Longer stretching leads to higher tensile strength and lower elongation at break. Meanwhile, stress in drying may prevent the formation of hydrogen bonds inside collagen fibers and change the weaving structure of collagen fibers, resulting in decreased hydrothermal stability of leathers. Cyclic stress may provide leathers with better dry heat resistance than constant stress. Also, a simplified model of collagen fibers movement was introduced, to establish a relationship between processing and properties of leathers from viewpoint of collagen fiber structure. Note de contenu : - EXPERIMENTAL : Materials - Methods for the preparation of leather samples - Characterization
- RESULTS AND DISCUSSION : Hydrothermal shrinkage - Dry heat shrinkage resistance -Thermal degradation - FT-IR spectra - SEM images - Effect of stress on the mechanical properties - Sketch of fiber orientation in cyclic stressEn ligne : https://drive.google.com/file/d/1skrzEiALHoMVXyDF0Duly4pKtAzL1WX9/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31091
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 10 (10/2018) . - p. 318-325[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20280 - Périodique Bibliothèque principale Documentaires Disponible Effect of different fiber fly quantity on surface of cellulose diacetate filament / Pengxiang Li in CHEMICAL FIBERS INTERNATIONAL, Vol. 63, N° 3 (09/2013)
[article]
Titre : Effect of different fiber fly quantity on surface of cellulose diacetate filament Type de document : texte imprimé Auteurs : Pengxiang Li, Auteur ; Shaohua Wu, Auteur ; Xiaohong Qin, Auteur ; Jianxin Huang, Auteur ; Yuefei Wang, Auteur ; Zhanping Yang, Auteur Année de publication : 2013 Article en page(s) : p. 156-159 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Diacétate de cellulose Le diacétate de cellulose, appelé parfois simplement diacétate, est un polymère artificiel. En effet, il est fabriqué par traitement de la cellulose par l'acide acétique.
Il est constitué de deux radicaux acétate sur chaque unité de D-Anhydroglucopyranose de la molécule cellulosique.
Il est à différencier des acétate de cellulose et triacétate de cellulose.
Il est fragile parce qu'à base de cellulose. Lorsqu'il se détériore, la cellulose se rétracte et libère l'acide acétique, ce qui provoque un "syndrome du vinaigre".
Energie de surface
Fibres textiles -- Surfaces
Fibres textiles synthétiques
Hydrophilie
Microscopie à force atomique
Microscopie électronique à balayage
Morphologie (matériaux)
VolardsDéchets de fibres très courtes, libérés dans l'air pendant les opérations de transformation des textiles, comme le battage, le cardage, la filature et le tissage.Index. décimale : 677.46 Cellulosiques : rayonnes, acetates Résumé : Cellulose diacetate has been used in the cigarette filter industry due to numerous advantages such as its odorlessness, very good moisture absorption, non-toxicity and perfect filtering function. A systematic analysis on the surface of cellulose diacetate filament was made to compare the effect of different fiber fly quantity on cellulose diacetate filament. Scanning electron microscopy, Atomic Force Microscopy and X-ray Photoelectron Spectroscopy were used to characterize the morphology and elements on the surface of cellulose diacetate filament. In addition, specific surface area and surface hydrophilicity of cellulose diacetate filament were also tested. It was found that the quantity of exfoliated fiber fly had a significant effect on the surface properties of filaments. With the fiber fly quantity increasing, the contact angle of filaments decreased, and the 0/C value increased, leading to the improvement of surface hydrophilicity. The gel particles dispersed in the filaments leaded to the protuberance formation on the filament surface. The surface roughness of filaments enhanced when the fiber fly quantity increased. The specific surface area test also showed that there was an increasing trend in the specific surface area of filaments with higher fiber fly content. Note de contenu : - Morphologies of cellulose diacetate filaments
- Analysis of the element on surface
- Analysis of surface energyPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19274
in CHEMICAL FIBERS INTERNATIONAL > Vol. 63, N° 3 (09/2013) . - p. 156-159[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15475 - Périodique Bibliothèque principale Documentaires Disponible Effect of fiber percentage and stacking sequence on mechanical performance of unidirectional hemp and palmyra reinforced hybrid composites / Varanasi Lakshmi Narayana in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 30, N° 3-4 (08/2020)
[article]
Titre : Effect of fiber percentage and stacking sequence on mechanical performance of unidirectional hemp and palmyra reinforced hybrid composites Type de document : texte imprimé Auteurs : Varanasi Lakshmi Narayana, Auteur ; Lokavarapu Bhaskara Rao, Auteur ; Siva Bhaskara Rao Devireddy, Auteur Année de publication : 2020 Article en page(s) : p. 143-151 Note générale : Bibliogr. Langues : Français (fre) Catégories : Chanvre et constituants Le chanvre ou chanvrier (Cannabis sativa L.) est la seule espèce du genre botanique Cannabis. Ce terme latin est souvent utilisé aussi comme nom vernaculaire pour distinguer les variétés de chanvre cultivé à usage industriel des variétés de cannabis à usage récréatif ou médical. C'est une espèce de plante annuelle, de la famille des Cannabaceae. La graine de chanvre s'appelle le chènevis.
Composites à fibres végétales -- Propriétés mécaniques
Essais dynamiques
Fibres de chanvre
Humidité -- Absorption:Eau -- Absorption
Microscopie électronique à balayageIndex. décimale : 668.4 Plastiques, vinyles Résumé : The use of natural fiber reinforced composites gains attention due to its weight and reasonable strength in the recent years. Generally, the mechanical performance of the hybrid composites are superior than the mono fiber reinforced composites. In this work, two different types of natural fibers, namely hemp and palmyra fibers, are selected as reinforcement materials for the development of unidirectional fiber reinforced hybrid composites. Composite laminate was fabricated with four different weight percentages (10 wt.%, 20 wt.%, 30 wt.% and 40 wt.%) and three different hybrid ratios (1:1, 1:2, and 2:1) of hemp and palmyra. The influence of fiber percentage and stacking sequence on the mechanical performance such as tensile strength, flexural strength, impact energy, and hardness of the hybrid composites was evaluated. From the results, it was observed that the adding 30 wt. % of hemp and palmyra fiber can increase the tensile strength and flexural strength by a percentage of 112% and 241% respectively. The impact energy absorption and the hardness of the hybrid composites are examined and compared. The experimental results shows that the hybrid composites containing high fiber weight percentage contribute to significant increase in impact energy and hardness. Morphological analysis is done using Scanning Electron Microscope (SEM). Note de contenu : - EXPERIMENTAL : Materials - Composite preparation Physical and mechanical testing of hybrid composites
- RESULTS AND DISCUSSION : Density and void percentage - Water absorption - Tensile strength - Flexural strength - ILSS - Impact energy - Micro hardness - Interfacial analysis using Scanning Electron Microscope
- Table 1 : Properties of hemp and palmyra fiber
- Table 2. Detailed designation and composition of fabricated composites
- Table 3 : Theoretical, experimental densities and void percentage of the composites
- Table 4 : Comparison of tensile strength (MPa) of hybrid, hemp and palmyra fiber reinforced composites
- Table 5 : Comparison of flexural strength (MPa) of hybrid, hemp and palmyra fiber reinforced compositesDOI : https://doi.org/10.18280/rcma.303-405 En ligne : https://www.iieta.org/download/file/fid/39666 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37640
in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 30, N° 3-4 (08/2020) . - p. 143-151[article]Effect of ionomer on barrier and mechanical properties of PET/organoclay nanocomposites prepared by melt compounding in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 4 (09/2011)
[article]
Titre : Effect of ionomer on barrier and mechanical properties of PET/organoclay nanocomposites prepared by melt compounding Type de document : texte imprimé Année de publication : 2011 Article en page(s) : p. 444-455 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique
Diffractométrie de rayons X
IonomèresUn ionomère est un copolymère thermoplastique « réticulé ioniquement ». La réticulation améliore la cohésion du polymère et la conductivité électrique.
Matériaux -- Propriétés barrières
Matériaux hybrides
Matériaux hybrides -- Propriétés mécaniques
Microscopie électronique à balayage
Microscopie électronique en transmission
Montmorillonite
Polyesters
Polyéthylène téréphtalate
ThermogravimétrieIndex. décimale : 668.4 Plastiques, vinyles Résumé : Poly(ethylene terephthalate)/organo-modified-montmorillonite (o-MMT) nanocomposites were prepared via melt compounding. A polyester ionomer was used as a compatibilizer to increase the interaction between the nanoclay and PET. The nominal o-MMT content was 2 wt.% and the ionomer/organoclay (mass ratio) was 3 : 1. The samples were characterized by WAXD, SEM, TEM, TGA, rheometry, DSC, O2 permeation and tensile testing. It was found that the addition of the ionomer improved the dispersion of the nanoclay particles in the PET matrix, leading to an exfoliated structure for the samples prepared by twin screw extrusion and by an internal mixer (Brabender). This was confirmed by larger complex viscosity and storage modulus at low frequency for molten samples. However, a subsequent processing using single screw extrusion to produce films resulted in thermal degradation of the organo-modifier of the clay and collapse of the gallery spacing. DSC results revealed that the cold crystallization temperature of nanocomposites-based films decreased and the melt crystallization temperature increased with the introduction of the organoclay, due to the strong heterogeneous nucleation effect of the clay particles. The tensile modulus of extruded films increased, while the yield strength remained constant with the incorporation of the organoclay. The oxygen permeability of PET-ionomer nanocomposites decreased as compared with samples containing no ionomer. DOI : 10.3139/217.2477 En ligne : https://drive.google.com/file/d/1SXNNB-UEB9KQVAqhmCzUtqPvX8hIUoLp/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12449
in INTERNATIONAL POLYMER PROCESSING > Vol. XXVI, N° 4 (09/2011) . - p. 444-455[article]Réservation
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